package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.mapper.CategoryMapper;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * @author: 青肆
 * @date: 2022/8/17 21:26
 * @description: CategoryServiceImpl
 */

@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {
    @Autowired
    private DishService dishService;

    @Autowired
    private SetmealService setmealService;

    //根据id删除分类，删除之前进行判断
    @Override
    public void remove(Long id) {


        LambdaQueryWrapper<Dish> dishLambdaQueryWrapper = new LambdaQueryWrapper<>();
        //添加查询条件，根据分类id进行查询
        dishLambdaQueryWrapper.eq(Dish::getCategoryId, id);
        int count = dishService.count(dishLambdaQueryWrapper);
        //查询当前分类是否关联了菜品，如果已经关联，抛出一个业务异常
        if (count > 0) {
            //已经关联菜品，抛出一个业务异常
            throw new CustomException("当前分类项关联了菜品，不能删除");
        }

        LambdaQueryWrapper<Setmeal> setLambdaQueryWrapper = new LambdaQueryWrapper<>();
        //添加查询条件，根据分类id进行查询
        setLambdaQueryWrapper.eq(Setmeal::getCategoryId, id);
        int count2 = setmealService.count(setLambdaQueryWrapper);

        if (count2 > 0) {
            //查询当前分类是否关联了套餐，如果已经关联，抛出一个业务异常
            throw new CustomException("当前分类项关联了套餐，不能删除");
        }

        //删除分类
        super.removeById(id);
    }
}
